Leakage detection device for radioactive gas containment system of nuclear power plant

Abstract

The utility model discloses a leakage detection device for a radioactive gas containment system of a nuclear power plant. The leakage detection device comprises a connecting mechanism, a plugging piece and a fan mechanism, according to the radioactive gas containing system for the nuclear power plant, the connecting mechanism is connected with the pipeline of the radioactive gas containing system for the nuclear power plant, equipment and the pipeline of the radioactive gas containing system for the nuclear power plant can be inflated and pressed through the fan mechanism, and then a leakage point can be determined through sound, touch and leakage detection liquid; if a leakage point is found, timely maintenance is carried out, so that possible radioactive gas is prevented from leaking into the environment to injure personnel during containment gas emission, and a clean pressurizing air source can be obtained under the condition that a system expansion joint or a pipeline is not dismantled; the leakage detection device for the radioactive gas containment system of the nuclear power plant has the characteristics of simplicity in operation, convenience in mounting and dismounting, reduction of human errors, convenience in movement and adjustability in air volume and air pressure, and ensures safe and stable operation of a nuclear power unit.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of nuclear power plant radioactive gas, especially to a nuclear power plant radioactive gas containment system leak hunting device. BACKGROUND

[0002] The equipment and pipeline of the nuclear power plant radioactive gas containment system frequently have the problem of not being tightly sealed, taking the small air volume cleaning pipeline of the containment atmosphere monitoring system (ETY) as an example, when the containment agreed discharge gas, there may be radioactive gas accidentally released without filtering by the iodine adsorber, increasing the risk of personnel internal exposure and forced retreat of the unit. In order to ensure the safe and controllable discharge of the radioactive gas in the containment, regular pressure test and leak hunting and defect elimination work need to be carried out on the ventilation pipeline. The original technology cannot identify defects in advance and the consequences of accidental release of radioactive gas have occurred when the leak is found, and temporary measures are often used to deal with the leak, which is not thorough. Before the annual efficiency test of the ETY iodine adsorber, leak hunting is also carried out, in order to obtain clean air source, the fan front expansion joint on the system needs to be removed, the mixed circuit cannot be used, and it needs to be completed within 8 hours, the leak needs to be eliminated again, and there is a risk of overtime. In addition, the original technical scheme needs the cooperation of multiple departments, and the coordination workload is large, which is easy to cause human error. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a nuclear power plant radioactive gas containment system leak hunting device.

[0004] The utility model adopts the technical scheme in the technical solution: a nuclear power plant radioactive gas containment system leak hunting device is constructed, which comprises a connecting mechanism, a plugging piece and a fan mechanism;

[0005] The first end of the connecting mechanism is used for connecting with the pipeline of the nuclear power plant radioactive gas containment system, the second end of the connecting mechanism is used for connecting with the fan mechanism, the fan mechanism is used for carrying out the sealing test on the pipeline of the nuclear power plant radioactive gas containment system, and the plugging piece is used for plugging the connecting mechanism.

[0006] The fan mechanism comprises a fan body, fan blades, a transmission assembly and a transportation assembly, the fan body is connected with the connecting mechanism, the fan blades are installed in the fan body, the transmission assembly is used for driving the fan blades to move, and the transportation assembly is used for transporting the fan body and the transmission assembly.

[0007] In some embodiments, the connecting mechanism comprises a ventilation pipe connected with the pipeline of the nuclear power plant radioactive gas containment system and a connecting pipe, the connecting pipe is used for connecting the ventilation pipe with the air outlet of the fan body;

[0008] The ventilation pipe is connected with the pipeline of the nuclear power plant radioactive gas containment system through a support for reinforcing connection, and the plugging member is used for plugging one end of the ventilation pipe.

[0009] In some embodiments, the ventilation pipe is a three-way pipe or a straight pipe.

[0010] The inner diameter of the ventilation pipe is 250-300 mm, and the connecting pipe is a hose.

[0011] In some embodiments, the transmission assembly comprises an electric drive, a transmission connecting shaft connected with the output end of the electric drive, a bearing box for supporting and positioning the transmission connecting shaft, and the end of the transmission connecting shaft away from the electric drive is connected with the fan blade.

[0012] In some embodiments, the transportation assembly comprises a base, a support seat mounted on the base, a plurality of universal wheels mounted under the base, and a handrail connected with the base, and the electric drive is mounted on the support seat.

[0013] In some embodiments, a damping device is arranged on the support seat, and the damping device is used for damping the electric drive.

[0014] In some embodiments, a motor electric heater is arranged on the electric drive.

[0015] In some embodiments, a slide rail is arranged on the support seat, and the electric drive is mounted on the slide rail.

[0016] In some embodiments, the fan mechanism further comprises an electric control box mounted on the side surface of the support seat.

[0017] In some embodiments, the fan mechanism further comprises a protective cover mounted on the support seat and covering the outer periphery of the transmission connecting shaft.

[0018] The utility model discloses the following beneficial effects are had: the nuclear power plant radioactive gas containment system is connected with the pipeline of nuclear power plant radioactive gas containment system through the connection mechanism setting, and through the fan mechanism setting, the equipment and pipeline of nuclear power plant radioactive gas containment system can be inflated and pressurized, then the leakage point can be determined through sound, touch and leak detection liquid, if the leakage point is found in time maintenance, avoid the possible radioactive gas leakage to the environment when the containment gas discharges to the harm of personnel, in the case where the system expansion joint or pipeline is not removed, clean and clean pressurized air source can be obtained, and the nuclear power plant radioactive gas containment system leak detection device has the characteristics of simple operation, convenient installation and removal, reduces human error, convenient movement, air volume and air pressure adjustable, guarantees the safe and stable operation of nuclear power unit, can satisfy the pressurized leak detection occasion of other ventilation systems or civil ventilation air conditioning system of nuclear power plant, and the scope of application is wide. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the utility model, the utility model will be further described below in combination with the drawings and examples, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings. In the drawings:

[0020] Fig. 1 It is the structure diagram of connection mechanism in some embodiments of the utility model;

[0021] Fig. 2 It is the front view structure diagram of fan mechanism in some embodiments of the utility model;

[0022] Fig. 3 It is the side view structure diagram of fan mechanism in some embodiments of the utility model. DETAILED DESCRIPTION

[0023] In order to have more clear understanding of the technical features, object and effect of the utility model, now the specific implementation mode of the utility model is described in detail with reference to the drawings. In the following description, it should be understood that the orientation or position relationship indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like is the orientation or position relationship shown in the drawings, the particular orientation is constructed and operated, and is only for the convenience of describing the technical scheme, and cannot be understood as indicating that the indicated device or element must have a particular orientation, therefore cannot be regarded as the limitation to the utility model.

[0024] It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "below" another element, the element can be "directly" or "indirectly" above another element, or one or more intervening elements can exist. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Please refer to Figs. 1 to 3 It is a leak detection device for a nuclear power plant radioactive gas containment system in some embodiments of the present application, which comprises a connecting mechanism 1, a plugging piece 2 and a fan mechanism 3. The first end of the connecting mechanism 1 is used for connecting with the pipeline 4 of the nuclear power plant radioactive gas containment system, the second end of the connecting mechanism 1 is used for connecting with the fan mechanism 3, the fan mechanism 3 is used for sealing test of the pipeline 4 of the nuclear power plant radioactive gas containment system, and the plugging piece 2 is used for plugging the connecting mechanism 1. The fan mechanism 3 comprises a fan body 31, fan blades 32, a transmission assembly 33 and a transportation assembly 34, the fan body 31 is connected with the connecting mechanism 1, the fan blades 32 are installed in the fan body 31, the transmission assembly 33 is used for driving the fan blades 32 to move, and the transportation assembly 34 is used for transporting the fan body 31 and the transmission assembly 33. When the fan mechanism 3 is not used for leak detection of the pipeline 4 of the nuclear power plant radioactive gas containment system, the plugging piece 2 can be used to plug the connecting mechanism 1 to ensure normal use of the nuclear power plant radioactive gas containment system.

[0026] Specifically, the nuclear power plant radioactive gas containment system mainly comprises common fans, air valves, heaters, fireproof valves, pre-high efficiency filters, iodine adsorbers and related air pipes and instruments, adopts common pre-fan and positive pressure air blowing device arrangement mode. During normal operation of the unit, small air volume cleaning pipeline intermittently updates the atmosphere in the containment, and the pressure is reduced after purification by the iodine adsorber, so that the pressure difference between the inside and outside of the containment is not more than 6 KPa. During power operation of the unit, the discharge is agreed, the containment isolation valve is in the open state, and the unit is in an unsafe state when the pipeline leaks. If leakage occurs during the efficiency test of the iodine adsorber, the processing time will be very urgent according to the existing test method of disassembling the expansion joint or part of the pipeline. The discharge pipeline will have adverse effects when leakage occurs. Therefore, in this embodiment, the nuclear power plant radioactive gas containment system leak detection device is installed between the first isolation valve and the second isolation valve of the small air volume cleaning circuit of the nuclear power plant radioactive gas containment system to conduct a sealing test on the nuclear power plant radioactive gas containment system.

[0027] Understandably, the nuclear power plant radioactive gas containment system is connected with the pipeline 4 of the nuclear power plant radioactive gas containment system through the connecting mechanism 1, and the equipment and pipeline 4 of the nuclear power plant radioactive gas containment system can be inflated and pressurized through the fan mechanism 3. Then the leakage point can be determined through sound, touch and leak detection liquid. If the leakage point is found in time, the possible radioactive gas leakage into the environment during containment gas discharge can be avoided to cause harm to personnel. In the case of not disassembling the system expansion joint or pipeline, a clean and clean pressurized air source can be obtained. The nuclear power plant radioactive gas containment system leak detection device has the characteristics of simple operation, convenient installation and disassembly, reduction of human error, easy movement, adjustable air volume and air pressure, ensures the safe and stable operation of the nuclear power unit, can meet the pressurized leak detection occasions of other ventilation systems of nuclear power plants or civil ventilation and air conditioning systems, and has wide application range.

[0028] As shown in Fig. 1 , the connecting mechanism 1 comprises an air pipe 11 connected with the pipeline 4 of the nuclear power plant radioactive gas containment system and a connecting pipe for connecting the air outlet of the fan body 31 with the air pipe 11. The air pipe 11 is connected with the pipeline 4 of the nuclear power plant radioactive gas containment system through a support for reinforcement connection, and the plugging piece 2 is used to plug one end of the air pipe 11. The air pipe 11 is a three-way pipe or a straight pipe, the inner diameter of the air pipe 11 is 250mm to 300mm, and the connecting pipe is a hose. The three-way pipe or straight pipe can select different types of air pipes 11 according to different use scenarios. The inner diameter of the air pipe 11 is preferably 270mm, and the air pipe 11 can be painted and anticorrosive after installation.

[0029] As shown in Fig. 2As shown, the transmission assembly 33 comprises an electric drive 331, a transmission connecting shaft 332 connected with the output end of the electric drive 331, a bearing box 333 for supporting and positioning the transmission connecting shaft 332, and the transmission connecting shaft 332 is connected with the fan blade 32 at the end away from the electric drive 331, and the transmission connecting shaft 332 can transmit the torque output by the electric drive 331.

[0030] In addition, the transportation assembly 34 comprises a base 341, a support seat 342 mounted on the base 341, a plurality of universal wheels 346 mounted under the base 341, and a handrail 343 connected with the base 341, and the electric drive 331 is mounted on the support seat 342. The universal wheels 346 can facilitate the movement and transportation of the entire fan mechanism 3, and the handrail 343 facilitates the operator to push the fan mechanism 3.

[0031] Further, the support seat 342 is provided with a damping device 344 for damping the electric drive 331. The damping device 344 can be a spring damper, a hydraulic damper or other forms of damper, which is not limited here. The electric drive 331 is provided with a motor electric heater 334 to prevent damage to the electric drive 331 caused by air moisture during shutdown. The support seat 342 is provided with a slide rail 345, and the electric drive 331 is mounted on the slide rail 345, which can conveniently adjust the position of the electric drive 331. The fan mechanism 3 further comprises an electric control box 36 mounted on the side of the support seat 342, which can install the related electrical elements of the fan mechanism 3. The fan mechanism 3 further comprises a protective cover 35 mounted on the support seat 342 and covering the outer periphery of the transmission connecting shaft 332, which can protect the transmission connecting shaft 332.

[0032] The leak detection steps of the leak detection device of the nuclear power plant radioactive gas containment system are as follows: removing the blocking piece 2, connecting the ventilation pipe 11 and the air outlet of the fan body 31 using the connecting pipe, then starting the fan mechanism 3, inflating and pressurizing the air in the pipeline 4 of the nuclear power plant radioactive gas containment system, determining the leakage point through sound, touch and leak detection liquid, and repairing the leakage point in time if found. After the test is completed, the fan mechanism 3 is stopped, and the blocking piece 2 is restored.

[0033] It can be understood that the above embodiments only express the preferred embodiments of the utility model, the description is more specific and detailed, but it can not be understood as the limitation of the utility model patent scope; it should be pointed out that for ordinary skilled person in the art, the above technical features can be freely combined without departing from the concept of the utility model, and a number of modifications and improvements can be made, which belong to the protection scope of the utility model; therefore, any equivalent transformation and modification within the scope of the utility model patent claim should belong to the scope of the utility model patent claim.

Claims

1. A leak detection device for a containment system for radioactive gases in a nuclear power plant, characterized in that, The connecting mechanism (1), the blocking piece (2) and the fan mechanism (3); The first end of the connecting mechanism (1) is used for connecting with the pipeline (4) of the radioactive gas containment system of the nuclear power plant, the second end of the connecting mechanism (1) is used for connecting with the fan mechanism (3), the fan mechanism (3) is used for sealing test of the pipeline (4) of the radioactive gas containment system of the nuclear power plant, and the blocking piece (2) is used for blocking the connecting mechanism (1); The fan mechanism (3) comprises a fan body (31), fan blades (32), a transmission assembly (33) and a transportation assembly (34), the fan body (31) is connected with the connecting mechanism (1), the fan blades (32) are installed in the fan body (31), the transmission assembly (33) is used for driving the fan blades (32) to move, and the transportation assembly (34) is used for transporting the fan body (31) and the transmission assembly (33).

2. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 1, wherein, The connecting mechanism (1) comprises a ventilation pipe (11) connected with the pipeline (4) of the radioactive gas containment system of the nuclear power plant and a connecting pipe used for connecting the ventilation pipe (11) with an air outlet of the fan body (31); The ventilation pipe (11) is connected with the pipeline (4) of the radioactive gas containment system of the nuclear power plant and is reinforced by a support, and the blocking piece (2) is used for blocking one end of the ventilation pipe (11).

3. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 2, wherein, The ventilation pipe (11) is a three-way pipe or a straight pipe; The inner diameter of the ventilation pipe (11) is 250mm to 300mm, and the connecting pipe is a hose.

4. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 1, wherein, The transmission assembly (33) comprises an electric drive (331), a transmission connecting shaft (332) connected with an output end of the electric drive (331), a bearing box (333) used for supporting and positioning the transmission connecting shaft (332), and the transmission connecting shaft (332) is connected with the fan blades (32) at an end away from the electric drive (331).

5. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 4, wherein, The transportation assembly (34) comprises a base (341), a support seat (342) installed on the base (341), a plurality of universal wheels (346) installed under the base (341), and a handrail (343) connected with the base (341), and the electric drive (331) is installed on the support seat (342).

6. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 5, wherein, The support seat (342) is provided with a damping device (344) used for damping the electric drive (331).

7. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 4, wherein, The electric drive (331) is provided with a motor electric heater (334).

8. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 5, wherein, The support seat (342) is provided with a sliding rail (345), and the electric drive (331) is installed on the sliding rail (345).

9. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 5, wherein, The fan mechanism (3) further comprises an electric control box (36) installed on the side of the support seat (342).

10. The nuclear power plant radioactive gas containment system leak detection apparatus of claim 5, wherein, The fan mechanism (3) further comprises a protective cover (35) installed on the support seat (342) and covering the outer periphery of the transmission connecting shaft (332).

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